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Screen goes dim, then goes to blank after a couple minutes

I have 4.3u. Used letterbomb, installed bootmii as IOS. Then I loaded many IOS's (using modmii). Things worked well day 1. But now when I load HBC, the screen goes a little dimmer than system menu. I can then launch usb loader GX and launch a USB backed up game. It works fine, but after a few minutes, it seems to go to screensaver. The screen just goes blank. If I up the volume on the TV, it comes back. But then goes away. I rebooted, to no avail. It does this with all games, whether from disc or USB. I've checked my AV in, unplugged and plugged in, I move the screen time out in HBC to 1HR. - to no avail.
Any thoughts?
cIOS's loaded
202, 222, 223, 224, 249, 250,
ios
9-64-v1034, 11, 12-64, 13,14,17,20,21,22,28,30,31,33,34,50,52,55,56,57,58 ,60,61,62,70,80